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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec98fb9d8823d022753b3154a6bf69f4d264c637fc8866433866c311af280f8' 
  AND token = 'pkudfrw3fLW7kOki5fbBKNGTII5y4xGaPhUCPkWauDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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