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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a8e37d06e6da5fc87158ee5d2c4ec5683d0db060094568201aab24fb5d08fb' 
  AND token = 'Cvh23GfbigpBcnrb/5y0dpeJ0CsRuU7E4R380XaCxB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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