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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0cf5a9d6a1de150303f4ca663b5281c0324f930111bcdebce26b5fe990ae728' 
  AND token = 'cvzegx0qxco+TCu/ciYLehl2qv2TrI4RO2ciIAQL6/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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