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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88084eca60215113f6b27cc19bd9027c919c273e582870f0402dd360dde125db' 
  AND token = 'x/mzHIlLlCywn5tvMTXv/zi4KzrDMr6x3cXp66q7AmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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