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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab94ae932237cb27717b68b3f07a1012584c6356ec7969254a68a9a7981efa7' 
  AND token = 'mwOz11gZ4dwAOh/RkbScE1P22cv9f1zaTSohiqAdQRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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