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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a4799e5a97d4a62edb1eee0a0712c409f044c25e23da0a416f6e8f03da41f3' 
  AND token = 'hDUX4sW918WgeZhXY29+LhDW50z1CQdfyxV2NCub7vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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