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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18e059e9410d1a09c90c2591b880dde01a4fb6debb01dcac23273438530d08c' 
  AND token = 'zh0HKm1DWSb+68vzvSJEz0dem4dsJ7xA9W6eukfXiGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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