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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd959855500839e4adb57aaa4b5a7ed41d856ee60a8916a98ffd909873bc57e55' 
  AND token = '8bxwxRSIo2K3KuLRZI93Z8G0gKJLf1oB1483eGMkJJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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