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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dab0a7067d088cb6a74c16cffab59911d36a165532c5b5f29b8184d52d9f149' 
  AND token = 'Iell1Z8KwVJkc7n4kle4R4hMRKRQyxmXNet/+HKrYu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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