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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e599875e2dff7d3c364b1b6bad4da0b00f86af0fc7eb86a161d6c7123f2174' 
  AND token = 'CIPBFkEkY6ov1ejFSft60bLH5lPw/9CNPbAnF1U75tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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