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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a22cc9dc1f5156c3c6a850d27942f89f0ba616589591f0eed81a7fffe1c7937' 
  AND token = '+K8txr8I5cZ4w9vUuJlZ5mch6tg5+rI2XqqBmU573+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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