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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb9b8a301d85b40e8ae8285430d973771ee426fb067699cc4d0e51d934f75a0b' 
  AND token = 'fbY6S7ZzUg6kh6HcwXi9eSX7+fj4N17UyPxTEPnCWSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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