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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ce841e5eceb2349c99d9f01527584470b879d9d5cca8ac9ff8698613179ceb' 
  AND token = 'PiVM8YefA8P1bzXcKkNHM/yQyumrGvzNaV9sYf96hqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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