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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7785cb7f7e254c43dbe099c0fee3f18cf0ccd79fc84ba8055a121cecd6a4b1d' 
  AND token = 'jJu4Rk2VGfwhLoKNqWeVAkExAHznWLEMmS7Y+AxdkD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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