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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9cc4796b5027b6fe4e397374b9877146e8897f1c34e3760871acf0a42a88acc' 
  AND token = 'Y6D45bpAcpVV1UltfCQ49BIvbSzwpVBozGy6sX6iP+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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