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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2c543969ab9c9cd8c5f483f99ae56f4407d45ba2e47a1ddb18b41fef010558' 
  AND token = 'wDX8H2y0/WJNV6eGNGb4Q5iQl47tV4YToLNnIPKaZtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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