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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a76cea35d4a6626a086f77efa9153af92f20ea3c8954d939e7d09931d320c3' 
  AND token = 'lAcN5ddEllxT9+4LD1K4RyCxFsOu7h8yuJr/iupSKXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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