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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '413373966243ed166a3b48576175c3ba4176872a928a34f136f005c59603ed2b' 
  AND token = 'r/KGoCF/S7AO/8AP4O+lRYb/L/x64QD4tWrk3DMyrkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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