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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc76c4e1511d8bdda538eafa4c17c6ddef8e1318e78de2c2c8a5498e86d23b54' 
  AND token = 'OW2Q3mJ320E0XZqH9bu32BuJ/y9O1SNaCt3vVJGlgl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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