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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a15a16bc775858e3c766ad1e81597715c10af4202aba4fcc507b59a6a1fca38' 
  AND token = 'bf1DPwS1Q/AORNxt+E1PHOIo/BI5WUIKmZ32nUl1vdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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