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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d635fca8bba68b38083b4da9177ad04a293b9f876f01350bd31af340426eb3b' 
  AND token = 'JGcHCGXPWIje1038n/G0vZwzTyC+zLpPHPNApcMto1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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