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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec96663c798dca442061e5525483014cccabe177f3c24b907792a94c282c0f7' 
  AND token = 'Tcae3yOowN71AdsMUtOZ4PfxwjN82kOQ8npNPBqKs78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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