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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d7b1e89a0813043bedf0dafaa050a6e95c924efe01b98f98834cad6ff12f96' 
  AND token = 'jfPv+XjjDALFEhFwyKSyNQK79msCbNLnyCce7zZ4bBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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