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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aee0e7282ac24590c5141a87eb6d6945f53e55f6afa35efc02836fef387b8a96' 
  AND token = 'nFAbr3BQfwgjS21J/81glkbfIquqDM8wID/PEHs08l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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