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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd56904e5cd22aacbd10780b35ff93e23f4db79b435ef99f2c717cabd2ece91' 
  AND token = '8BoxCc/22er+Z/DZ3EJtvqW+z6247bhTcy7PbulGvpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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