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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056f83e109293e19891b15d8d746e86079a8aae64ddcfc499273c0bf1e8114e7' 
  AND token = 'm0efz0+Blb1/umZq/hIRLo1Acf9iUp/j8N426f8jT0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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