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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5064aff9e71cccea842443d7462af0f2b6606d4a1a082c52dda705fca98db171' 
  AND token = 'dw5r6H9YmKSxFzc4x1AY0dpjjBEN6keBv3/lSTGCy54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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