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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29334864168e7d324def10cdce29554fe40731e5e53ec45cb3ab55e350ed7e12' 
  AND token = '0rN3x4vU/ZDXVxV9OgQIocG0/53khhTopuy1qvi5y8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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