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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6477a4b123e54071f4121770d15767a53a9cedee247477fbe39db66672f7da63' 
  AND token = '4/xG2eLju/cfTLjuW2/r4U79+T9Xa9U+TAb2gDsGfxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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