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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b14fcea55ca299eb0d400940c30990974c619b78874b22c6da6cd751817bbee5' 
  AND token = 'xQevOVpejX93LuKzXYU65OCj1lG3Evx3ATZUndn4lFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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