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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '313c25cfd821aa3197af335d999e3f98e268720e61f818ccfa874cc17ff16852' 
  AND token = '37vUtiskMH8d7qTozD39ikR74FSQ/ifObtpxIhYJZQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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