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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e226e871104057f8e6b9050a864f52b3e96303d464ce3e90512a89913d4c416' 
  AND token = 'vNnNhJO7D0Jex0PLAQEAW9kumv6sTEX4ekeXGVBPXjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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