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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c32ac8f40b31c57f34130d33b778b6f168a1017d67d641befccdc01b092b99f4' 
  AND token = 'Sr7yr0QDP5JsSlvl1FBjUjOtZsgAs5sUygQoavie8NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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