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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '484ab31a814c1cf2e7f6d4cbe86446e262aa27c8006b58c07f4fffa6636b4d3d' 
  AND token = 'nzldlMVSsrAsDutxCqF/N24jLI0WrQ+LxqafgXcjESU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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