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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad7a141199fc1cd45ad65415903420e7e3686afd2417cdbcc63238cd2eb4cda' 
  AND token = 'Ajn59hl9fbYbmoY9Gy+5bcw1QKJW0MhI7BVIbHBMHb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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