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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e27ac21f36c48384c42a44ec080da53238639854087e3def25bf10d414bb3d0b' 
  AND token = 'L7c6QdB3nOlWDwUbub6QaMk0m7QjBq7Oa2ThS4lGo00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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