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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4472e13a1ccaa69d4e985fa468dd30c16b86470a00acee03ae3ea508ae9b5d7f' 
  AND token = '08J6PtjKi4t6OhRKJfh1ceOaaJz9eOnjdZYqZq6H6HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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