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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57becbc41836cf157221548fa47785a5a44b5de79c14949c3503817f3d794def' 
  AND token = '+9dg2VTxqXGlngyv7fZNGNwAdrm93il9Ooode3nigCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}