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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a99978195f98a37ddad46ac36fe0e0fcaa1699356c84922897f28bc5a8a33294' 
  AND token = 'z2muDp8f+JdAELSPaVPMBjKusf8H4IXnAxKhYu7KI8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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