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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c2ede4524a6940a43385845af6a0d8ae10441c4da3731ab7ee398dcc4b764ad' 
  AND token = 'F1xI7YNaCZ6jxaEKiU0ojPid/yEoivsv8vQ/bOMyhyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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