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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e17560e60659dec3659ce97bdb528ae1bba795e1b8b8f18385d62badeac0779' 
  AND token = 'pWuA6VcPsMEh0CObPhpPHhxh+S+Tqel3jKwMRIKc4M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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