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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c9b965c6ca416c2c19b963ccdfecf4db2d28aa2d44c560bc47254ba33030681' 
  AND token = 'rMGOzbxekOw3sARrOjhbBpCepw1Y/NT0ztHt1YDkY+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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