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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e73163359bd3b1c6a259a89ac82572d50dce6ba429304925d2a43ea30579dd' 
  AND token = 'O12WUhOoQUYmGKrghZX/DTz4udpCwgZdnj5wPMbOI5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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