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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8e60ba77a23838b2eea12af51e963af41dca8ded7efb248a24dfce7e031626' 
  AND token = 'zYontMOmfd2vT21HHscbGvZRrNZY00ZCrEFYpReTx5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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