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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d84d6539140087439d1aeda8615bc14f5416a337287ff2c5c4e98e75dec2f7' 
  AND token = 'uC8lMmENdo2M+pDwW6Mn9oLhuZf8920T3v9fyS4Ojno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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