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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f68e0485ebac343574466ad643e1e99ee8ae8ad75da85d283351d88e18e5f8' 
  AND token = 'V7Z9jLrasWon/cLTtLml3M2LC+76+07wKPY1Fx7d69M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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