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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa600a5b0e203b1abc6ea4d976cd235e1c3a64035c6ef5e4d57fc910a6f32dfe' 
  AND token = 'D309xXvUhVSA6ayu5K0wRi16FuyT4k7hquIJMIqAnvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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