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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd014eb3d6e2fdfdea000c51abb2b7f2bafa0cb08f27476502258bfccb6fccb8b' 
  AND token = 'wHwBW+qruDQmcWJeK1Q5hoehzBdU5/Qrw/KVc5aLbpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00127

JSON explain

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