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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c02a9d05fbeaa947d6cf9b185cb3aec6e7f525ecc88b88ee13a8f6785feae5c' 
  AND token = 'hyu2greh0LBZYsmF68vnielIXYP1vcrwOMs7najFN8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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