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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d65ade84b0e56abe015a86230e6d3070edd3b2b3c982fc8a3bca9be35350e7' 
  AND token = 'vADLooBSA0cag8HhgfaTDxiJ7N19UincDDWFccX0Jrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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