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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b4db9fc09b74856139b94dd92108182ceb3c1a32b74ebcfb41bad6357c4b983' 
  AND token = 'XUgry+Etu7AuDF/BkOQWers4cCtbbqQ1kZUafYw0RIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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