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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56112eef66588f968a88b6f0ea9252653b700f6d34907f2cc1fed8d7bf69a6c1' 
  AND token = 'IDSML185WzkzJshf3VQbItHSCB7J4c/PlIia5a6lWJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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