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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1809e8264e8aac4f1beabe1c36ae49e30bd0b0ca8aefa82d722f8114013b7a0' 
  AND token = 'E9xuRoHFvH+efJFMW+0jOJ5G0m0Fcazi57z+6YcLBIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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