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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc471cf42b385a27166b58e7ea6cf932fe406c449af2b045b5c3e401b949c5cd' 
  AND token = 'HNFiinm56EcEk1dNLP7ZlR4A+tsDy3+0u7wCefuNFcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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