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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3690a37824e978a8080112fe35c8a72a6f6d0e407bad6e97031cd8758e970f' 
  AND token = '51IhL/iK5kmLx1mY2NKywkGCbt4S74ZuQHEUGMyvO7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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