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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac44d28efc4354898eba919e30aa5acfb4cc36ef07993cbad45ae527f6f92219' 
  AND token = 'mRy6V6ndoMz9ANdp3q95VAn/NnpEdojztPd38o3fe0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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