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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67c5a58c222861329e3a2084ce100420529d84b427951af947a33c81d423e052' 
  AND token = 'kFm8IYbKAI4O+SyaYoar/2oCenn1atBKNUlxPlc8Nd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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