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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9de2b1d3fd45c56e8bd01b645528b0105d825fd8591967b5c01f7c37b2d066aa' 
  AND token = 'UlqhY3g8lh2FxDXIZz7ayP2Ww3aH4MecaQ9/1Y95Fq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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